Update hello_asset.adoc

Made HttpZipLocator code more readable.

src/docs/asciidoc/jme3/beginner/hello_asset.adoc

@@ -216,9 +216,9 @@ Here is a HttpZipLocator that can download zipped models and load them:
 [source,java]
 ----
 
-    assetManager.registerLocator(
-      "https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/jmonkeyengine/wildhouse.zip", 
-      HttpZipLocator.class);
+    assetManager.registerLocator( "https://storage.googleapis.com/"
+            + "google-code-archive-downloads/v2/code.google.com/" 
+            + "jmonkeyengine/wildhouse.zip", HttpZipLocator.class);
     Spatial scene = assetManager.loadModel("main.scene");
     rootNode.attachChild(scene);